永磁交流伺服驱动系统共模EMI噪声的预测及抑制  

Prediction and suppression of CM EMI in permanent magnet AC servo drives

作　　者：余伟[1] 王世山[1] 虞振洋 周峰[1] 

机构地区：[1]江苏省新能源发电与电能变换重点实验室,南京航空航天大学,江苏南京210016

出　　处：《电工电能新技术》2015年第8期62-68,共7页Advanced Technology of Electrical Engineering and Energy

基　　金：国家自然科学基金(51177071);台达环境与教育基金会《电力电子科教发展计划》(DREK2013 004)资助项目

摘　　要：永磁交流伺服驱动系统中高du/dt、di/dt在系统中寄生参数作用下感应出的电磁干扰,随着开关频率的不断提高,已逐渐影响到其在高精密场合下的可靠运行。电磁干扰(Electromagnetic Interference,EMI)模型的研究,是电磁干扰分析、预测及其抑制的基础。本文研究出一种永磁交流伺服驱动系统共模EMI噪声的预估方案:针对典型系统中的智能功率模块(IPM)装置,通过分析开关管状态切换过程中IPM桥臂中点电位的跳变,等效出共模噪声源模型;在阐述共模干扰传播路径的基础上,利用不同方法提取了传播通道中所涉及的各主要部件(变流器、屏蔽线缆及永磁同步电机)的高频参数;在150k Hz^30MHz频段内,对其共模EMI噪声进行了实际测量,与仿真结果的对比验证了本文所建模型的正确性。根据样机实测EMI噪声,对于超出电磁兼容标准部分,提出了通过设计平面EMI滤波器滤除的方案,最终通过实验对该新型滤波器噪声抑制效果的有效性进行了验证。With the constant increase of switching frequency in power electronic devices,the reliable operation of permanent AC servo drives working in sophisticated occasion is more and more easily influenced because of EMI produced by the mutual action of higher du / dt and di / dt with parasitic parameters. EMI modeling plays an important role in analyzing,predicting and suppressing EMI. Therefore,a method of predicting common mode EMI（ CM EMI） in permanent magnet AC servo drives is explored in this paper. As far as the IPM equipment in a typical system is concerned,its voltage of mid-leg jumps constantly. An equivalent model of CM EMI noise source is presented by analyzing that phenomenon. The propagation path of CM EMI is stated,and then the high frequency parameters of the main parts（ including the power converter,shielded cable and Permanent Magnet Synchronous Motor（ PMSM）） are extracted with different methods. In 150 k Hz ~ 30 MHz frequency range,actual measurement of CM EMI is completed. Compared with the simulation result,the validity of the proposed model is confirmed finally.The EMI noise of the prototype is measured. A method to suppress the noise is proposed,in which a planar EMI filter will be used. The final experimental measurement shows that this filter can greatly reduce the noise in this system.

关 键 词：永磁交流伺服驱动系统 共模干扰源 参数提取 共模干扰模型 平面EMI滤波器 

分 类 号：TM921.51[电气工程—电力电子与电力传动]